How to add Parameters for DB2 Database behind code?

To begin with, I wanted to mention that I am very new to C# and working with ASP.NET. I am interning this summer for an electric utility company with their .NET group and I've been asked to create a website that pulls the data from their IBM DB2 Database.

Functionality of the website:

I have added two Text Boxes, Drop Down List, and a submit button. I have also added the post back function behind the code, which seems to work fine. The problem that I seem to be having is when I add the parameters to the query. Could someone please guide
me in the right direction. I have provided the WebForm and the code behind below.